Adjusting Roll Gap: Polyurethane Rolls - MacDon R113 Operator's Manual

4. Steel Rolls: The length of thread (A) extending above
the jam nut on the adjustment rods can be used as an
approximation of roll gap but does NOT provide
consistent roll gap measurements. Roll gap factory
setting is 6 mm (1/4 in.). Refer to
Gap: Steel Rolls, page

3.14.2 Adjusting Roll Gap: Polyurethane Rolls

Because polyurethane rolls operate at smaller gaps and the conditioning is less aggressive, the roll gap setting is
more sensitive than on steel rolls. To return roll gap to the factory setting, follow the procedure below.
DANGER
To avoid bodily injury or death from unexpected startup of the machine, always stop the engine and
remove the key from the ignition before leaving the operator's seat for any reason.
1. Lower self-propelled disc header fully.
2. Stop engine and remove key.
3. Loosen upper jam nut (A) on both sides of conditioner.
4. Turn lower nut (B) counterclockwise until upper roll
rests on lower roll.
5. Turn lower nut (B) one full turn clockwise to raise the
upper roll and achieve a 3 mm (1/8 in.) roll gap.
6. Hold nut (B) and tighten jam nut (A) on both sides of
header.
7. Rotate the rolls manually and use a feeler gauge at the
ends of the rolls to check that the actual gap is no less
than 2 mm (5/64 in.) and no more than 4 mm (5/32 in.).
IMPORTANT:
Make sure roll gap adjustment nuts are adjusted equally
on both sides of the header to achieve a consistent gap
across the rolls.
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OPERATION
3.14.3 Adjusting Roll
86.
Figure 3.132: Roll Gap Adjustment
Figure 3.133: Roll Gap Adjustment
85
A
A
B
Revision A